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A natural satellite, moon, or secondary planet
is a celestial body that orbits a planet or smaller body, which
is called its primary. Earth has one large natural satellite,
known as the Moon. No "moons of moons" (natural satellites that
orbit the natural satellite of another body) are known. In most
cases, the tidal effects of the primary would make such a system
unstable. The seven largest natural satellites in the Solar
System are Jupiter's Galilean moons (Ganymede, Callisto, Io, and
Europa), Saturn's moon Titan, Earth's Moon, and Neptune's
captured natural satellite Triton.